The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change
Abstract The northeastern Tibetan Plateau is located at the convergence of the Asian winter and summer monsoons and westerlies; thus, this area has witnessed historic climate changes. The Xunhua basin is an intermontane basin on the northeastern margin of the Tibetan Plateau. The basin contains more...
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crwiley:10.1111/1755-6724.12571 2024-04-14T08:04:15+00:00 The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change Zenglian, XU Jianyu, ZHANG Junliang, JI Kexin, ZHANG 2015 http://dx.doi.org/10.1111/1755-6724.12571 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1755-6724.12571 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1755-6724.12571 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Acta Geologica Sinica - English Edition volume 89, issue 5, page 1649-1663 ISSN 1000-9515 1755-6724 Geology journal-article 2015 crwiley https://doi.org/10.1111/1755-6724.12571 2024-03-19T10:57:09Z Abstract The northeastern Tibetan Plateau is located at the convergence of the Asian winter and summer monsoons and westerlies; thus, this area has witnessed historic climate changes. The Xunhua basin is an intermontane basin on the northeastern margin of the Tibetan Plateau. The basin contains more than 2000 m of Cenozoic fluvial–lacustrine sediments, recording a long history of climate and environmental changes. We collected the mid‐Miocene sediments from the Xunhua basin and used palynological methods to discuss the relationship between aridification in the interior of Asia, global cooling, and uplift of the Tibetan Plateau. Based on the palynological analysis of the Xigou section, Xunhua basin, the palynological diagram is subdivided into three pollen zones and past vegetation and climate are reconstructed. Zone I, Ephedripites–Nitraridites–Chenopodipollis–Quercoidites (14.0–12.5 Ma), represents mixed shrub–steppe vegetation with a dry and cold climate. In zone II, Pinaceae– Betulaepollenites–Ephedripites–Chenopodipollis–Graminidites (12.5–8.0 Ma), the vegetation and climate conditions improved, even though the vegetation was still dominated by shrub–steppe taxa. Zone III, Ephedripites–Nitrariadites–Chenopodipollis (8.0–5.0 Ma), represents desert steppe vegetation with drier and colder climate. The palynological records suggest that shrub–steppe dominated the whole Xigou section and the content gradually increased, implying a protracted aridification process, although there was an obvious climate improvement during 12.5–8.0 Ma. The aridification in the Xunhua basin and surrounding mountains during 14.0–12.5 Ma was probably related to global cooling induced by the rapid expansion of the East Antarctic ice‐sheets and the relatively higher evaporation rate. During the 12.5–8.0 Ma period, although topographic changes (uplift of Jishi Shan) decreased precipitation and strengthened aridification in the Xunhua basin on leeward slopes, the improved vegetation and climate conditions were probably controlled by the ... Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library Antarctic Acta Geologica Sinica - English Edition 89 5 1649 1663 |
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Geology Zenglian, XU Jianyu, ZHANG Junliang, JI Kexin, ZHANG The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change |
topic_facet |
Geology |
description |
Abstract The northeastern Tibetan Plateau is located at the convergence of the Asian winter and summer monsoons and westerlies; thus, this area has witnessed historic climate changes. The Xunhua basin is an intermontane basin on the northeastern margin of the Tibetan Plateau. The basin contains more than 2000 m of Cenozoic fluvial–lacustrine sediments, recording a long history of climate and environmental changes. We collected the mid‐Miocene sediments from the Xunhua basin and used palynological methods to discuss the relationship between aridification in the interior of Asia, global cooling, and uplift of the Tibetan Plateau. Based on the palynological analysis of the Xigou section, Xunhua basin, the palynological diagram is subdivided into three pollen zones and past vegetation and climate are reconstructed. Zone I, Ephedripites–Nitraridites–Chenopodipollis–Quercoidites (14.0–12.5 Ma), represents mixed shrub–steppe vegetation with a dry and cold climate. In zone II, Pinaceae– Betulaepollenites–Ephedripites–Chenopodipollis–Graminidites (12.5–8.0 Ma), the vegetation and climate conditions improved, even though the vegetation was still dominated by shrub–steppe taxa. Zone III, Ephedripites–Nitrariadites–Chenopodipollis (8.0–5.0 Ma), represents desert steppe vegetation with drier and colder climate. The palynological records suggest that shrub–steppe dominated the whole Xigou section and the content gradually increased, implying a protracted aridification process, although there was an obvious climate improvement during 12.5–8.0 Ma. The aridification in the Xunhua basin and surrounding mountains during 14.0–12.5 Ma was probably related to global cooling induced by the rapid expansion of the East Antarctic ice‐sheets and the relatively higher evaporation rate. During the 12.5–8.0 Ma period, although topographic changes (uplift of Jishi Shan) decreased precipitation and strengthened aridification in the Xunhua basin on leeward slopes, the improved vegetation and climate conditions were probably controlled by the ... |
format |
Article in Journal/Newspaper |
author |
Zenglian, XU Jianyu, ZHANG Junliang, JI Kexin, ZHANG |
author_facet |
Zenglian, XU Jianyu, ZHANG Junliang, JI Kexin, ZHANG |
author_sort |
Zenglian, XU |
title |
The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change |
title_short |
The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change |
title_full |
The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change |
title_fullStr |
The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change |
title_full_unstemmed |
The Mid‐Miocene Pollen Record of the Xunhua Basin, NE Tibetan Plateau: Implications for Global Climate Change |
title_sort |
mid‐miocene pollen record of the xunhua basin, ne tibetan plateau: implications for global climate change |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1111/1755-6724.12571 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1755-6724.12571 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1755-6724.12571 |
geographic |
Antarctic |
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Antarctic |
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Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Acta Geologica Sinica - English Edition volume 89, issue 5, page 1649-1663 ISSN 1000-9515 1755-6724 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1755-6724.12571 |
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Acta Geologica Sinica - English Edition |
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89 |
container_issue |
5 |
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1649 |
op_container_end_page |
1663 |
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1796300685834190848 |